[samiam]

Mols of k^+ ion present in 2.00L solution of .311 M K3PO4
i found mols of K3PO4 and* 3 mol k+/1 mol k3po4.
For this type of question you do not need to right dissociation equation because it is referring to the ions in K3PO4?
so K3PO4---> 3k⁺+ PO4^-

or do you always write it?

[Mitch]

It is a dissociation problem, so it seems appropriate. If it asked for the amount of K⁺ in the solid form of K₃PO₄ perhaps not.